74.116.89.185.ip.verticalresponse.com has no MX records.
Question and response
Question
dig 74.116.89.185.ip.verticalresponse.com. MX
Answer
The response has no answer records.
Authority
verticalresponse.com. 1800 SOA demi.ns.cloudflare.com. dns.cloudflare.com. 2396763806 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0